Full Report
Microsoft has removed a compatibility hold that prevented some Easy Anti-Cheat users from installing the Windows 11 2024 Update because of a known issue that triggers restarts with blue screen of death (BSOD) errors. [...]
Analysis Summary
# Vulnerability: Update Block Lifted for Windows 11 Systems with Incompatible Easy Anti-Cheat (EAC)
## CVE Details
- CVE ID: N/A (This summary concerns a compatibility/update block removal, not a specific security vulnerability with a publicly assigned CVE.)
- CVSS Score: N/A
- CWE: N/A
## Affected Systems
- Products: Windows 11 (specifically the 2024 Update, potentially 24H2 mentioned in context)
- Versions: Systems with an incompatible, older version of Easy Anti-Cheat (EAC) installed.
- Configurations: Systems where EAC is launched as part of game execution.
## Vulnerability Description
The information describes a temporary safeguard hold Microsoft placed on Windows 11 upgrades (likely the 2024 Update/24H2) for systems using certain versions of Easy Anti-Cheat (EAC) that could cause instability, including Blue Screens of Death (BSOD) when games were launched. Microsoft has since lifted this update block, indicating that compatibility issues related to EAC causing crashes (or the specific issue that triggered the hold) have been addressed, either by patching Windows or by resolution with the anti-cheat vendor. The prior issue did cause BSODs primarily when older EAC versions were launched within a game.
## Exploitation
- Status: Not applicable (This is a compatibility issue that triggered a deployment safeguard, not a remote exploit.)
- Complexity: N/A
- Attack Vector: N/A
## Impact
- Confidentiality: Negligible (Compatibility issue)
- Integrity: Potential for system instability/crashes (BSODs) when running games using incompatible EAC.
- Availability: Brief reduction in availability of the Windows 11 2024 Update for affected users pending resolution/patching.
## Remediation
### Patches
- **Windows 11 Update:** The update block has been lifted, allowing affected users to receive the Windows 11 2024 Update. Users should ensure they are attempting to install the latest available cumulative or feature updates.
- **Easy Anti-Cheat (EAC):** The underlying issue was likely resolved by a patched version of EAC or a compensating fix in the Windows update. Users should ensure that game applications leveraging EAC are fully updated.
### Workarounds
- **Restart PC:** Microsoft advised gamers to restart their PCs to receive the Windows 24H2 update more quickly after the block was lifted (following the March fix for the Asphalt 8 crash issue).
## Detection
- **Indicator of Compromise (IoC):** Installation failures or system instability (BSODs) specifically occurring during the launch of games utilizing EAC on Windows 11 prior to the fix.
- **Detection Methods and Tools:** Monitoring Windows Update logs for error codes related to compatibility holds; monitoring system events for EAC-related crash dumps.
## References
- [Article discussing the temporary block removal related to EAC](https://www.bleepingcomputer.com/news/microsoft/microsoft-lifts-windows-11-update-block-for-easy-anti-cheat-users/)
- [Reference to earlier block related to EAC/Asphalt 8](https://www.bleepingcomputer.com/news/microsoft/microsoft-lifts-windows-11-upgrade-block-after-asphalt-8-crash-fix/)